$\lim_{x\to\infty}\left(\frac{x^2ne^{\left(-x^2n^2\right)}}{n^2+1}\right)$

$\left(m+\frac{5}{2}\right)^2$

$2\log x-2\log\left(x-1\right)=0$

$2cos^2\left(x\right)=sen2x$

$3003\left(\sqrt{16}\right)\left(729a^3b^6\right)$

$-2x<0$

$\left(-3\right)+4\cdot\left(-2.5\right)$